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There are only a few companies in the UK specialising in providing specialised surveys and mapping photography. Some provide pipeline, coastal, environmental and surface terrain surveys, others specialise in geophysical site investigations and sub-surface mapping. Between them, however, they offer a wide range of technical services and expertise, including, geo-referenced aerial photography, Global Positioning Systems (GPS), Photogrammetry, Geographic Information Systems (GIS), Digital Orthoimagery & LiDAR

Geophysical surveys are routinely employed in site investigations, as they are the only non-invasive method of identifying the nature of the features that lie below the subsurface. Applications include investigations into oil and mineral deposits, groundwater, archaeological, civil engineering, geological and environmental projects.

Initial Aerial photography - Successful mapping projects begin with precise aerial photography. Using the most accurate image capture equipment available is essential for best results. Certain specialised cameras, considered the most accurate aerial cameras available, incorporate the latest technology such as forward motion compensation, automatic crab compensation and a gyroscopic stabilization mount system. These cameras are compatible with in-plane photo-control GPS (where reaching pre-determined GPS coordinates, they trigger shutter actuation) and utilise either or both terrain-based and GPS control points for precision geo-referenced photography.

The Global Positioning System - GPS uses intersecting transmitted signals from orbiting geostationary satellites to accurately pinpoint locations on earth, and was devised for military navigation and targeting systems. Today, it forms the basis of many civilian and commercial applications including the determination of coordinates of natural features and man-made objects for mapping and GIS databases.

Photogrammetry - A photogrammetric mapping service uses a compilation of stereo images to produce accurate digital models and site plans.
Following an aerial photography survey of a site, digital images are downloaded to a computer where modelling software can produce the resultant model very rapidly.

Geographic Information Systems - GIS combines a number of different sources of geographical and topographic information and incorporates them into a layered database that can be interrogated and analysed in a variety of ways. This newly available tool is a sophisticated and spatially-referenced database able to be accessed by users for an almost limitless number of applications.

Digital Orthoimagery - DOI combines mapping information with its photographic image. The accuracy of photogrammetrically-scaled maps, GIS and the large amount of inherent information within aerial and satellite imagery provides a vast technical and scientific resource for both commercial and academic users. It can be used for constructing aligning overlays of geographical features such as natural resources and other features not visible on an ordinary, un-enhanced photograph.

LiDAR - Light Detection And Ranging is an airborne remote sensing technique able to record millions of 3-D geo-referenced points on a single survey mission. Using a pulsed laser beam, which is scanned from side to side as the aircraft passes over the survey site, it can measure up to 100,000 points per second. Specially adapted helicopters or fixed-wing aircraft can be used and typically, surveys are flown at about 1,000 metres and can collect data over a width of terrain up to 700m wide or a narrow cone for engineering corridors such as transmission and pipelines and road and rail tracks. Simultaneous image and terrain capture on the same pass speeds up processing and mapping, providing an accurate and cost-efficient method of 3-D terrain modelling for clients.

Mosaics - With the aid of modern mapping techniques and software, it is now possible to 'stitch' together large numbers of individual high-resolution photographs (taken as a pre-planned series of survey shots) to form a single, seamless image. Mosaics can therefore show large areas of terrain or towns in accurate, precise detail, not possible a short while ago.


We are able to identify the most appropriate company

to provide the specialist services you require.

Please contact Ron Bridle on 07789 871620
or e-mail via the Contact page.

 

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